DR. YUMIKO ISHIZAWA MD PHD MPH
NPI 1679555965
Anesthesiology - Critical Care Medicine in Boston, MA
About Dr. Yumiko Ishizawa Md Phd Mph NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. YUMIKO ISHIZAWA MD PHD MPH (NPI 1679555965) is an individual critical care medicine provider in Boston, Massachusetts, licensed in Massachusetts (224094) and active in the NPI registry since November 2005. She is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and is a graduate of Other (1985).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Yumiko Ishizawa Md Phd Mph is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Yumiko Ishizawa reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Massachusetts General Hospital
Acute Care Hospitals · Boston, MAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Yumiko Ishizawa's NPI number?
The NPI number for Yumiko Ishizawa is 1679555965. It was assigned to this individual provider in the NPPES registry on November 14, 2005.
Where is Yumiko Ishizawa located?
Yumiko Ishizawa practices at 55 Fruit St Anesthesia Associates, Boston, MA 02114. The listed phone number is (617) 726-3030.
What is Yumiko Ishizawa's specialty?
The primary specialty registered for this NPI is Anesthesiology, specializing in Critical Care Medicine, with taxonomy code 207LC0200X.
Is Yumiko Ishizawa enrolled in Medicare?
Yes. Yumiko Ishizawa is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Yumiko Ishizawa's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Yumiko Ishizawa reassigns Medicare benefits to 2 organizations: Massachusetts General Physicians Organization Inc (Boston, MA) and The General Hospital Corporation (Boston, MA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Yumiko Ishizawa's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Yumiko Ishizawa accept?
Health plans from Taro Health list Yumiko Ishizawa as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Yumiko Ishizawa affiliated with any hospitals?
According to CMS data, Yumiko Ishizawa is affiliated with Massachusetts General Hospital.
When was this NPI record last updated?
The NPPES record for Yumiko Ishizawa was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Yumiko Ishizawa, MD PHD MPH · NPI 1679555965
Critical Care Medicine physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since November 14, 2005.
## Identity
- **NPI:** 1679555965 (Entity type: Individual)
- **Enumerated:** November 14, 2005
- **Primary specialty:** Anesthesiology - Critical Care Medicine · taxonomy 207LC0200X
- **State license:** 224094 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 55 FRUIT ST, ANESTHESIA ASSOCIATES, Boston, MA 02114-2696
- **Phone:** (617) 726-3030
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1985
## Record status
- **NPPES last updated:** July 13, 2026
- **Other identifiers:** Medicaid 2103737 (MA); Other J28831 (MA); Other 468293 (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1679555965) · Data from the CMS NPPES public registry.